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Home > Products > Integrated Circuits (ICs) > Logic > Buffers, Drivers, Receivers, Transceivers

onsemi 74LCXZ16244MEAX

Name: 74LCXZ16244MEAX
Brand: onsemi
SKU: 74LCXZ16244MEAX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74LCXZ16244MEAX

Manufacturer:: onsemi

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 48-BSSOP (0.295", 7.50mm Width)

Datasheet:: 74LCXZ16244MEAX.pdf

Description:: IC BUF NON-INVERT 3.6V 48SSOP

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Product details

Overview

74LCXZ16244 from ON Semiconductor (formerly Fairchild) is a low-voltage 16-bit non-inverting buffer/line driver with 5V-tolerant inputs and outputs, designed for bus-oriented transmitter/receiver, memory/address, and clock driving applications. It operates at 2.7–3.6 V_CC, delivers ±24 mA output drive at 3.0 V, features nibble-level 3-STATE control (OE1–OE4), and guarantees power-up/down high-impedance behavior.

For engineers reviewing the 74LCXZ16244 datasheet, pinout, applications, or equivalent options, key selection considerations include 5V signal interface compatibility, 4.5 ns max propagation delay at 3.0 V, ±24 mA drive strength, nibble-selectable 3-STATE control, and SSOP/TSSOP/FBGA package options for space-constrained or high-density PCB layouts.

Technical Context

The 74LCXZ16244 implements sixteen independent non-inverting buffers grouped into four 4-bit nibbles, each controlled by a dedicated active-low Output Enable (OEn) input. Its CMOS-based architecture supports live insertion/withdrawal and ensures outputs remain in high-impedance state when V_CC is between 0–1.5 V during power transitions.

It integrates patented noise/EMI reduction circuitry and meets stringent latch-up (>500 mA) and ESD robustness requirements (HBM >2000 V, MM >200 V). Input voltage range spans −0.5 V to +7.0 V, enabling safe interfacing with 5 V logic while powered from 3.3 V or 2.7 V supplies.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	2.7 V to 3.6 V - Enables direct integration into 3.3 V systems without level shifters.
Input Voltage Tolerance	−0.5 V to +7.0 V - Allows safe connection to 5 V buses without external protection.
t_PD Max	4.5 ns at V_CC = 3.0 V, CL = 50 pF - Supports high-speed data transfer in address/data bus applications.
Output Drive	±24 mA at V_CC = 3.0 V - Drives multiple TTL loads or long traces without buffering.
I_OH/I_OL @ V_CC = 2.7 V	±12 mA - Maintains adequate drive margin in low-V_CC edge cases.
Power-Up/Down Z-State	Guaranteed for V_CC = 0–1.5 V - Prevents bus contention during hot-swap or power sequencing.
ICC Max	225 µA at V_CC = 2.7–3.6 V - Ensures ultra-low static power in battery-backed or standby circuits.

Pinout & Package

74LCXZ16244MEA is supplied in a 48-lead Small Shrink Outline Package (SSOP), JEDEC MO-118, 0.300" wide. Pin assignments are identical for SSOP and TSSOP variants per datasheet Figure 1.

Pin/Terminal	Circuit Role	Design Meaning
OEn (OE1–OE4)	Active-low 3-STATE enable per nibble	Four independent controls allow selective disabling of I/O groups (0–3, 4–7, 8–11, 12–15) to reduce dynamic power or isolate bus segments.
I0–I15	Buffer inputs	16 non-inverting inputs tolerant to 5 V; accept standard TTL/CMOS logic levels regardless of V_CC.
O0–O15	Buffer outputs	16 non-inverting outputs with ±24 mA drive; maintain 5 V tolerance even when V_CC = 2.7 V.
V_CC	Positive supply	Single 2.7–3.6 V rail powers all logic and output stages; no auxiliary supplies required.
GND	Ground reference	Dual GND pins (pins D4/D5, E4/E5, F4/F5, G4/G5) minimize ground bounce in high-speed switching.
NC	No-connect terminal	Unbonded pads (e.g., pins A3, A5, B3, B4, H3, H4, J2, J4) - must be left unconnected on PCB.

Key Features

Feature	Design Value
5V-tolerant I/O	Enables seamless interoperation between 3.3 V logic domains and legacy 5 V subsystems without external level translators.
Nibble-selectable 3-STATE	Four OE inputs permit granular bus partitioning-e.g., disable only upper address nibble during DMA cycles.
Guaranteed high-Z at power transition	Eliminates bus contention risks during hot-plug, brown-out, or asymmetric power ramp-up across system rails.
Patented noise/EMI reduction	Reduces simultaneous switching noise (SSN) and radiated emissions in dense PCB layouts with fast edge rates.
Latch-up immunity & ESD robustness	Exceeds 500 mA latch-up current and 2000 V HBM - suitable for industrial environments with noisy power or handling exposure.

Applications

Memory Address Buffering	PCI/ISA Bus Transceiver
Use Scenario: Driving 16-bit address lines from a 3.3 V microcontroller to legacy 5 V SRAM or EPROM. IC Role / Device Role / Timing Role: Non-inverting buffer with 5 V-tolerant outputs acting as level-shifting address driver. Use Value: Eliminates need for discrete level shifters; maintains <4.5 ns propagation delay to preserve timing margins in 25 MHz address strobes.	Use Scenario: Isolating and driving shared data/address bus lines between 3.3 V host controller and 5 V peripheral cards. IC Role / Device Role / Timing Role: Bidirectional bus transceiver using nibble-OE control to manage direction and segment enable. Use Value: Four OE inputs allow selective arbitration of bus segments, reducing contention and enabling partial bus refresh without full cycle stall.
Clock Distribution Network	Hot-Swappable Backplane Interface
Use Scenario: Fan-out of a 3.3 V system clock to multiple 5 V clock receivers (e.g., legacy ASICs or FPGAs). IC Role / Device Role / Timing Role: Low-skew (<1 ns) non-inverting clock buffer with guaranteed monotonic edges. Use Value: t_OSLH/t_OSHL ≤1 ns ensures minimal clock skew across 16 outputs, preserving setup/hold timing in synchronous systems.	Use Scenario: Interfacing hot-pluggable modules to a 3.3 V backplane where 5 V signaling persists during insertion/removal. IC Role / Device Role / Timing Role: Live-insertion-capable buffer providing isolation and drive strength during mechanical mating. Use Value: Guaranteed high-Z during V_CC ramp (0–1.5 V) prevents glitch injection into backplane during hot-swap sequences.

Memory Address Buffering

PCI/ISA Bus Transceiver

Use Scenario: Driving 16-bit address lines from a 3.3 V microcontroller to legacy 5 V SRAM or EPROM.

IC Role / Device Role / Timing Role: Non-inverting buffer with 5 V-tolerant outputs acting as level-shifting address driver.

Use Value: Eliminates need for discrete level shifters; maintains <4.5 ns propagation delay to preserve timing margins in 25 MHz address strobes.

Use Scenario: Isolating and driving shared data/address bus lines between 3.3 V host controller and 5 V peripheral cards.

IC Role / Device Role / Timing Role: Bidirectional bus transceiver using nibble-OE control to manage direction and segment enable.

Use Value: Four OE inputs allow selective arbitration of bus segments, reducing contention and enabling partial bus refresh without full cycle stall.

Clock Distribution Network

Hot-Swappable Backplane Interface

Use Scenario: Fan-out of a 3.3 V system clock to multiple 5 V clock receivers (e.g., legacy ASICs or FPGAs).

IC Role / Device Role / Timing Role: Low-skew (<1 ns) non-inverting clock buffer with guaranteed monotonic edges.

Use Value: t_OSLH/t_OSHL ≤1 ns ensures minimal clock skew across 16 outputs, preserving setup/hold timing in synchronous systems.

Use Scenario: Interfacing hot-pluggable modules to a 3.3 V backplane where 5 V signaling persists during insertion/removal.

IC Role / Device Role / Timing Role: Live-insertion-capable buffer providing isolation and drive strength during mechanical mating.

Use Value: Guaranteed high-Z during V_CC ramp (0–1.5 V) prevents glitch injection into backplane during hot-swap sequences.

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit buffer applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
74LVC16244ADGG	Lower V_CC min (1.65 V), slightly higher t_PD (5.2 ns), same 5 V tolerance, identical 48-pin TSSOP footprint.	Supports wider V_CC range including 1.8 V systems; less suitable for 2.5 V-only designs due to VIH/VIL thresholds.	Preferred for new designs targeting 1.8 V/3.3 V dual-rail compatibility and RoHS-compliant packaging.
SN74LVCH16244A	Higher drive (±32 mA), enhanced ESD (HBM >8000 V), same nibble-OE structure, but requires V_CC ≥2.0 V for guaranteed 5 V tolerance.	Better suited for high-noise industrial I/O expansion where extra drive and ESD margin are critical.	Select when board-level ESD robustness or driving long cables/PCB traces demands >±24 mA output capability.

Compared with 74LCXZ16244, the 74LVC16244ADGG offers broader voltage flexibility and modern packaging, while the SN74LVCH16244A provides superior drive strength and ESD resilience-both retain nibble-level 3-STATE control but differ in minimum operating voltage and absolute maximum ratings.

Availability

74LCXZ16244 is available at Aetrix Electronics and suitable for memory address buffering, PCI/ISA bus interfacing, clock distribution networks, and hot-swappable backplane interfaces requiring stable component supply despite end-of-life status.

Supply support for 74LCXZ16244 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

ON Semiconductor (formerly Fairchild Semiconductor) is a global semiconductor manufacturer specializing in power management, analog, sensor, and logic solutions for automotive, industrial, and computing markets.

The 74LCXZ16244 belongs to the LCX family of low-voltage, 5 V-tolerant logic devices engineered for mixed-voltage system interfacing-specifically addressing the need for robust, high-speed bus drivers in transitioning 3.3 V architectures.

FAQ

What is the recommended operating voltage range for the 74LCXZ16244?

The 74LCXZ16244 is specified for operation between 2.7 V and 3.6 V on V_CC. Operation outside this range-especially below 2.7 V-is not guaranteed per datasheet DC Electrical Characteristics. The device maintains 5 V input/output tolerance across this entire range, enabling reliable interfacing with 5 V logic even at minimum V_CC. Do not operate the 74LCXZ16244 at 2.5 V or lower without validation.

Does the 74LCXZ16244 support live insertion, and how is it implemented?

Yes, the 74LCXZ16244 supports live insertion and withdrawal per its datasheet Features section. This is achieved through guaranteed high-impedance outputs when V_CC is between 0 V and 1.5 V, preventing bus contention during mechanical mating. The internal power-up/down protection circuitry ensures outputs remain in Z-state until V_CC stabilizes above 1.5 V, making the 74LCXZ16244 suitable for hot-swap backplane applications.

How many independent 3-STATE controls does the 74LCXZ16244 provide, and what do they control?

The 74LCXZ16244 provides four independent active-low 3-STATE control inputs: OE1, OE2, OE3, and OE4. Each controls a 4-bit nibble-OE1 enables O0–O3, OE2 enables O4–O7, OE3 enables O8–O11, and OE4 enables O12–O15. This nibble-level granularity allows selective bus segmentation, such as disabling only the upper address byte during DMA transfers while keeping lower bits active.

What is the maximum output drive capability of the 74LCXZ16244 at 3.0 V VCC?

At V_CC = 3.0 V, the 74LCXZ16244 delivers ±24 mA per output pin under DC conditions, as specified in the DC Electrical Characteristics table. This drive strength supports fan-out to multiple TTL loads or driving moderate capacitive loads (e.g., 50 pF) with sub-5 ns propagation delay. The 74LCXZ16244 maintains this rating across the full operating temperature range (−40°C to +85°C).

Is the 74LCXZ16244 still recommended for new designs, and what should designers consider?

No-the 74LCXZ16244 is explicitly marked "DISCONTINUED" and "NOT RECOMMENDED FOR NEW DESIGN" in its official datasheet. Designers should migrate to functionally compatible alternatives like the 74LVC16244ADGG or SN74LVCH16244A. While existing 74LCXZ16244 inventory remains available for legacy repair and continuity, new designs must account for obsolescence risk, limited future supply, and lack of manufacturer support updates for the 74LCXZ16244.

74LCXZ16244MEAX Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: 74LCXZ

Package/Case:: 48-BSSOP (0.295", 7.50mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Logic Type:: Buffer, Non-Inverting

Number of Elements:: 4

Number of Bits per Element:: 4

Input Type:: -

Output Type:: 3-State

Current - Output High, Low:: 24mA, 24mA

Voltage - Supply:: 2.7V ~ 3.6V

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 48-SSOP

74LCXZ16244MEAX FAQ

1.How can I place an order for 74LCXZ16244MEAX through Aetrix?

Please submit a Request for Quotation (RFQ) for 74LCXZ16244MEAX on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for 74LCXZ16244MEAX reliable?

The price and inventory of 74LCXZ16244MEAX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LCXZ16244MEAX is usually 5 days.

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74LCXZ16244MEAX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74LCXZ16244MEAX order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for 74LCXZ16244MEAX?

For technical support, including 74LCXZ16244MEAX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LCXZ16244MEAX requirements.

6.How does Aetrix verify that 74LCXZ16244MEAX is sourced from the original manufacturer or authorized distributors?

All 74LCXZ16244MEAX products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 74LCXZ16244MEAX meets industry standards.

7.What is the process for return or replacement of 74LCXZ16244MEAX?

All 74LCXZ16244MEAX units undergo pre-shipment inspection (PSI). If there is an issue with 74LCXZ16244MEAX, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The 74LCXZ16244MEAX part is unused and in its original packaging.

Return procedure for 74LCXZ16244MEAX:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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